After the decision of the conference of the 16 health ministers of the states of Germany and enforced by the statement of the federal German health minister, the soccer arenas will not have any spectators until end of October 2020 at least. Because the other teamsports like volleyball have an even more grave issue due to their indoor mode, we can be sure, that this will hold also for volleyball in Germany until than.
IMHO there is no realistic chance, that this will change until the end of the year (in light of at last increased infections with COVID19) and even the possibility, that the season ends in empty halls is a rather likely - even in best case it seems impossible, to vaccinate/inoculate the Germans sufficiently until the end of the season.